20 Research Paper Topics on the History of the Middle East

20 Research Paper Topics on the History of the Middle East In our previous guide, 10 facts for a research paper on the history of the Middle East, we discussed facts that could help you compose a competent research paper, however, picking a suitable topic out of many for your research paper can be a daunting task. Our second guide focuses on providing you with 20 topics for the Middle East research paper that are suitable for your research. You can select any one you see appropriate to write upon or even come up with your own. Besides mentioning these 20 topics, we have also written a structured essay that contains credible information. This short sample essay will help you get a clear picture on how to write an essay or research paper on the topic you have chosen. We have also mentioned a few references at the bottom to help you discover more information on a particular topic. This last guide holds all the keys and tips on how to write a better research paper to help you score top notch marks. So, here are our 20 topics you can consider when you’re writing a research paper on the history of Middle East:   How has the Great Pyramid of Egypt Managed to Stay Undamaged for over a Century?   How the Discovery of Oil Changed The Middle Eastern Economy   A study on Increasing Population of the Middle East and The Risks It Causes   Why Was Turkey Unaffected During World War II   Why America’s Interest in the Middle East is Growing Day by Day   A Study on how and when Middle East Political Disputes Began.   A Research on the Impact of Media in Middle Eastern Wars.   How the Palestine Conflict Started.   Why Saudi Arabia Remain Safe During World War II   The Role of Foreign Countries in the Prevailing Unrest in the Middle East   A Conceptual Study of the Traditional Islamic Ideology in the Middle East.   A Study on Influence of Religious History in the Middle East.   The Impact of War on the Middle East.   How Historical problems originated in the Middle East?   A Study on Overgrowing Refugee Problem in Middle East.   How and Why Turkey Adopted to both Western and Islamic Principles.   How the Ottoman’s Got Out of the Middle East Are Foreign Forces a Cause of Palestine-Israel Conflict How Saudi Arabia Became a Leader in the Middle East Why Jews Started to Settle in Palestine These topics would without a doubt help you grasp the initial idea on how to begin composing your research paper. To make things much simpler, we have picked one of the topics from the 20 given topics to create an essay that will help you understand the dynamics better. Here is a sample essay to help you understand. Sample Essay: How and Why Turkey Adopted to Both Western and Islamic principles? The Middle East was always a home to some religions and customs. Cultural conflicts were on the rise and people used to follow in the footsteps of their ancestors, without giving it a second thought. During this time, a revolution strike pushing some people to try what others had to offer, and Turkey was one such country. It started to learn more about the western world and understand its customers. Many say this also has to do a lot with the country’s geographical location as it is a part of Europe as well. If we have a look a Turkey now, after 200 years, it is centered around the western ways and traditions to quite an extent. However, deep down it is following Islamic ways. The everyday lives of the Turks have been a mixture of both eastern and western cultures. Turks are descendants of Djingis Khan, and they fall into the family of Uzbeks. They were influenced by the rulers of Ottoman Empire. Ottomans had been trying to adapt to the western ways as they thought westernization was important to survive in that era, especially when they were falling out of favor. The historical background of the people of Turkey doesn’t completely fall under one category. They have adapted to a little of every culture since the very beginning. Turkey can be labeled as the bridge between the Europe, Asia, and Arabia, however not just geographically, but also when it comes to customs and traditions. Accommodating western culture into the Turkish society was a well-thought-out move. However, neighboring Islamic states did not approve of it. Islamists see western culture as an opposing force towards Islam, but the Turks think otherwise. They think that adapting to a bit of western culture would allow them to grow more. Hayat is one of the oldest magazines that served in Turkey back in the days, and Hollywood movie actors are still quite famous in Turkey as they were before. During 1957 1958, the Hayat magazine was on the rise in popularity,   such famous artists as Ava Gardner, Brigitte Bardot, Elizabeth Taylor, Sylvia Lopez, Ingrid Bergman and Susan Hayward were found on the covers of the Hayat magazine and Hollywood’s love among the Turks kept on increasing with time. The Turks began to follow the lifestyle of the American actors. Western literature also influenced Turkish literature. Immersed in the western ideologies and styles, Turkish writers love following the western style of writing. They are found to be translating western work into Turkish work. A Turkish social thinker called Ziya Gokalp once wrote: â€Å"We belong to the Turkish nation, Islamic community, and western civilization. Our literature must direct itself to the people and, at the same time, to the West. † Turkish people are American food lovers as well. You can also find alcohol and pork easily in the country, despite it being a Muslim nation and Islam prohibiting drinking and pork. However, according to experts, this is largely due to the nation’s wish to promote tourism and welcome international guests. There you have it, let us now move on to our third and final guide which focuses on how to write a good research paper on a specific topic. But before that, let’s have a look at the references mentioned below. References: Regan Austin, Jesse DeLauder, Rebecca Luhrs, Laura Adriance, Austin Stockwell Tese Wintz Neighbor (2008), Turkish Culture and Society: Where East Meets West. https://www.world-affairs.org/wp-content/uploads/2012/03/turkey_resource_packet__study_unit__cba_-_web_version_final.pdf Douglas Arthur Howard (2013). The History of Turkey. Greenwood Publishing Metz, Helen Chapin, ed. (1996). Turkish Origins (fifth ed.). Imber, Colin (2014). The Ottoman Empire, 1300–1650, The Structure of Power Schaller, Dominik J; Zimmerer, Jà ¼rgen (2008). Late Ottoman genocides: the dissolution of the Ottoman Empire and Young Turkish population and extermination policies – introduction Rafis Abazov (2009). Culture and Customs of Turkey. Mango, Andrew (2000). Atatà ¼rk: The Biography of the Founder of Modern Turkey

How to Write a Free Will Philosophy Essay

How to Write a Free Will Philosophy Essay Free Will Philosophy Essay Features of writing a philosophy essay on Free Will How to start writing Tips on how to start How to write an outline How to write a thesis for a philosophy essay on Free Will How to write an introduction Tips on how to write an introduction and thesis How to write body paragraphs Tips on body writing How to finish a philosophy essay on Free Will Tips on conclusion writing Tips on revision Sample Essay on Free Will Features of writing a philosophy essay on Free Will Writing about free will might seem easy but you may face a few challenges. First of all, for students who are not in the philosophy class, it would be vital to get familiar with the diverse schools of thought. As a writer, you must always have a position, especially when your essay is argumentative. Your position must always be substantiated by clearly elucidated points or arguments. As you will come to realize, philosophy papers require a lot of research so keep digging until you get arguments you find convincing. Ensure your paper is persuasive and that your readers will eventually either be forced to argue against your argument or will agree with your argument. How to start writing When you interact with accomplished writers, they will tell you to never be in a hurry when you want to start writing any paper or article. Additionally, they will caution you on how you start the writing process because it determines your grade. The first thing you need to know when you are writing an essay on Free Will is that it needs a lot of research. For you to determine your position and to develop persuasive arguments, you need to immerse yourself deeply in research. However, unlike what many students do, avoid the temptation of reading too much without making or taking relevant notes down. Therefore, make short notes while reading and especially any argument or point which you find convincing or relevant to your article. Remember also to develop an outline because it will make your work easier. Separate the sections (introduction, body, and conclusion) while you are creating the outline. Most importantly, however, determine your position. Tips on how to start Here are a few tips to help you start an essay on Free Will: Conduct extensive research. Take notes as you research. Develop a position or stance. Determine relevant arguments to help you write your essay. Develop or create an outline for your paper. How to write an outline Developing an outline is an important step in the writing process. Essentially, it contains the sections of your writing (introduction, body, and conclusion) and the points you will include in your paper. An outline should be thorough and contain all the points and arguments you wish to include in your paper. The thorough it will be, the better and easier it will be for you when you start creating your essay. However, remember it should be deeply grounded in research. So, below is a sample of an outline for an essay on Free Will. Introduction Define free will. History of free will. Thesis statement – free will does not equal free choice. Body First argument + evidence. Second argument + evidence. Third argument + evidence. The fourth argument – an opposing argument. Conclusion Restate your thesis. Enhance the argument by including something that will further the debate or discussion on Free Will. How to write a thesis for a philosophy essay on Free Will A thesis is simply your main point or argument. It includes your position and should be clearly written and included in the introduction. How to write an introduction The introduction indeed the most important section of your paper. This is because it is after reading your introduction that most writers will either be bored and quickly move on to something or will be highly interested and continue reading. Therefore, you need to start strongly and keep your readers yearning for more. Remember that your introduction should be brief and to the point. Accomplished writers will ask you to disclose enough to arouse your readers’ interest but make it brief to make them want and yearn for more. This tactic will keep them reading. Tips on how to write an introduction and thesis While writing the introduction and thesis, consider the following: Start with a hook, something to arouse the interest of your readers. Make it brief but with enough points. Include the thesis statement. Narrow the focus or scope of your thesis. How to write body paragraphs The body paragraphs mainly contain the supporting points or arguments. As stated earlier, the thesis statement contains your position or main argument. However, your paper will not be complete if it lacks supporting arguments or evidence to back up your thesis. The body section, therefore, is also another important piece in an essay. Each body paragraph must have a point that it is trying to communicate. Additionally, every point or argument must also be followed by ample supporting evidence. However, before you proceed to the conclusion (and this is mainly if you are writing an argumentative paper on Free Will), remember to include one last paragraph which elucidates further on the strongest argument against your position. Tips on body writing To write a perfect body, consider the following tips: Each paragraph must start with a topic sentence which holds the supporting argument. Every supporting argument must be followed by supporting sentences or ample evidence. Make use of transition words to show when you are moving from one point to another. Tie your points to the thesis statement and ensure they all help to further explain your position. Be thorough and always cite whenever you include information which is not original. For an argumentative essay, include an argument that is against your stance. How to finish a philosophy essay on Free Will When you are writing, the energy you start with must be coherent and be rationally and evenly distributed in your entire paper. Therefore, your conclusion must be as strong as your introduction and body. For a philosophy essay on Free Will, you will need to restate your position and also include the main points from your essay. However, instead of the clichà © ending, you can also include something like an anecdote to help further the discussion on free will. Tips on conclusion writing Consider the following tips while writing your conclusion: Restate your position or thesis statement. Mention the main points from your essay. Include an anecdote or a few sentences to help further the discussion on Free Will. Tips on revision Revising an essay simply entails the processes which help you to get a perfect essay. Accomplished writers will always stress this step because many students are usually in a hurry and often forget to revise their papers before they submit them. However, ensure that you always take this step seriously. Below are some tips to help you revise your paper the next time you write an essay: Read through your work several times after you have finished writing while making the necessary corrections. Ask a friend or a relative to read your work and to pinpoint any mistakes they might come across. Use some of the online revising tools to help you discover any mistakes you might have missed as you were proofreading. Philosophy Essay Sample: Free Will Almost every webpage or book written about free will seems to continue or further the various debates and disagreements brought by the term. All philosophers seem to want to say something regarding free will and each comment is always met with a certain response. However, one argument regarding the term always seems quite shallow to me. Often, you will hear some accomplished philosophers say that human beings do not have free will because God knows what we will do even before we do it. The simple fact that God is all-knowing and that he knows whichever choice we make means we are not free and are, therefore, not making any free choices as we would like to think. However, I believe this argument is irrelevant, and this is because of three things: knowing what happened, what happens, and what will happen does not necessarily equal to any interference; having a God who knows everything including our choices does not mean we are limited in the choices we make but that He knows what we wi ll choose in the future; God is also not limited to the past, present or the future and time is not in any way part of His being or nature. Free will is often defined as man’s innate ability to make equal or unrestricted choices. God knows all our choices, and this includes the ones we made, ones we are making, and the ones we will make. However, Him knowing these things is not equivalent to Him preventing or allowing some to happen. Every human being has an infinite number of options at every turn, but everyone always chooses among the ones he/she is familiar with. Unless in countries where dictatorship exists, my choice of an option is never restricted, but I always choose from a pool of options that I know of. However, the consequences or results are never affected, restricted or even impacted by God knowing the choice I will make. Him knowing never affects me. Additionally, God knowing also does not mean my choices are limited but that He knew beforehand what I would be up to today. God knew I would write this article, but I had the option of refusing to write it or even delegating it to someone else. My other options are still intact, and I am the one who decided to write the paper and Him knowing had nothing to do with the decision I made. My natural ability to choose or to make a choice is not affected and remains intact. I can choose to leave this article here and ask a friend to finish it for me. However, I am making a conscious choice to continue writing it. God knowing that I will write it or give it to a friend to finish has nothing to do with the choice I will make. Finally, a majority of the people with this notion believe that time is part of God’s nature or being. However, if the future like the present exists for God, then God is not part or does not exist in man’s time realm. Additionally, it means God is not restricted to the past, present, or the future. His being is everywhere hence our future choices are known to Him like our present choices are. Additionally, this only means that He knows what we, in our freedom, will choose come the time to make certain choices. This, however, does not take away our free will or our freedom to act or think as freely as we might like.

Analysis of the movie The Help Essay Example | Topics and Well Written Essays - 2250 words

Analysis of the movie The Help - Essay Example She uses their experiences in writing a book that highlights the struggles of the civil rights era. The book is from the view of the two house helps. It exposes the racism that they encounter in their daily working life. The book covers the existing relationships between the white employers, and their black house helps. This is especially considering that the black maids raise the children of their white employers. These children tend to have prejudiced attitudes towards their parents when they become adults. The daily interactions between the maids and their white employers reveal the various intercultural communication concepts and behavior between two different races with different cultural backgrounds. Institutional Collectivism is the first concept that is evident in the film. It is an intercultural concept in which the practices or the norms of a particular culture encourage and reward collective action (Jandt 201). Cultures with institutional collectivism have certain characteristics. Such a culture, for example, has its members assuming and believing that they are highly interdependent within the social organization. Group loyalty is highly encouraged even if it is against the pursuit of individual goals. The concept of Institutional Collectivism tends to maximize the interests of the social grouping and the collective as a whole. The concept allows for organizational collaboration and cooperation in achieving collective goals. The concept is seen in the film because they are certain groups advocating for the cooperation and collaboration of social groupings. They advocate for the achievement of social and economic gains of the group. For example, the white women led by Hilly hold regular meetings in which their collective interests are discussed. Moreover, they plan how to accomplish and achieve their interest. This group is known as the Bridge Club. During one of their regular

Sustainable development practices in civil engineering projects Essay

Sustainable development practices in civil engineering projects - Essay Example Therefore, civil engineers should play a very big role in sustainability since they are responsible for designing and building structures that support the society’s daily lives. [2] Sustainable Development In any professional career, there are a set of code of ethics that guide the practices in that field and thus must always be followed. Almost all countries in the world have these set of ethics and relevant bodies that ensure they are followed. For instance, the American Society of Civil Engineers (ASCE) Code of Ethics in the USA defines how Civil Engineers should be practice professionally. Sustainable development is the pillar of any engineering practice since if it is followed strictly, then other ethical practices will immediately fall in to place. [1] Sustainability can be defined as a way of using a resource in way that it is not depleted permanently. In construction, it can also be referred to as green construction since it is concerned with socio-economic and environ mental impact of creating structures that can be reused. Therefore to ensure sustainability, contractors and engineers are required to design and build structures that will not cause long-term damage to the environment. Sustainable structures are supposed to energy efficient, ensure health safety of people living in around it and also reduced pollution and waste release. [1] Sustainable Development Practices Civil Engineers play a very important role in sustainable development. A civil engineering project will require the incorporation of a various professionals from various disciplines i.e. geologists, biologists, surrounding community and agencies concerned with the enforcement of the code of ethics. All these groups have interest in the project and are supposed to ensure that the project meets all the sustainability practices and also ensure their interests are not put at risk. It is the responsibility of a civil engineer to combine all the interested disciplines and parties in o rder to produce a design and build a structure that meets the goals of the client. [5] For instance, if a new building structure is to be built in an area that was initially used for crop farming, the surrounding area must be able to continue support crop farming even after the completion of the project. Also, if the area is surrounded by a major water body and is used for recreation, these water body need not to be polluted and recreation has to continue after completion of the project. This therefore requires aspect of sustainability practice. A civil engineer will have the responsibility of determining if the characteristics of the soil, layout of the facility, the drainage of the site and the past usage of the land will support the characteristics of the new facility. The engineer will also determine if the available modes of transport system to the facility are adequate, come up with a design that will take into consideration both the aquatic habitat, flora and fauna and design the structure in a way that it has minimal environmental impact to the people living in the surrounding. The design of this facility should also meet the set code of ethics standard. Therefore for such a successful evaluation, an engineer must have an understanding and knowledge of these multiple disciplines and this is brought out by the concept of sustainable devel

Andragogy Research Paper Example | Topics and Well Written Essays - 1500 words

Andragogy - Research Paper Example Just as importantly, defining what makes an individual an adult has meaning when determining how they will perform when trying to learn. The seven steps to creating a learning planning for adults is called the progress model which means that solving problems is the focus of how learning is accomplished. The following paper will examine the assumptions that define andragogy and the meaning behind them as they support adult learning and the differences between adult and child level learning capacities. Andragogy The origins of andragogy can be traced back to a German educator in 1833 who used the term to define adult education from child education. Alexander Kapp created the term which specifically means man-leading, which is in contrast to the term pedagogy which means child-leading. In the 20th century American education theorists defined three different types of adult learning. The first is andragogy, the second is self directed learning, with the third being transformative. Andrago gy is used as a description of adult learning as a concept in which the learner is motivated by a series of assumptions that end with the learner developing solution to problems in order to learn in the context that an adult learns best (Melik & Melik, 2010, p. 108). Defining andragogy is a bit difficult as it has been presented through a variety of different ideas and is therefore not quite a firm theory through which to filter ideas. Andragogy was originally presented with three assumptions. Some criticisms of the ideas behind andragogy is that it is focused on the individual and not a critical evaluation of the social perspective on adult learning. The concept of andragogy has been correctly criticized for not informing the social perspective, but Knowles suggests that it does not have to promote the social perspective in order to have value in developing a structure of ideas about adult learning. One of the main proponents of andragogy as a theory of learning for adults is Malco lm Knowles. Knowles introduced the idea in the 1970s in response to the fact that most theory on learning was focused on children (Utley, 2011, p. 32). He broke down the assumptions about the motivation for adult learning it six basic concepts. The following is a list of those concepts: 1. Adults need to know the reason for learning something (Need to Know) 2. Experience (including error) provides the basis for learning activities (Foundation). 3. Adults need to be responsible for their decisions on education; involvement in the planning and evaluation of their instruction (Self-concept). 4. Adults are most interested in learning subjects having immediate relevance to their work and/or personal lives (Readiness). 5. Adult learning is problem-centered rather than content-oriented (Orientation). 6. Adults respond better to internal versus external motivators (Motivation) (Pierson, 2011, p. 182). These six principles outline the motivations that adults need in order to create a meaning ful learning experience. The development of andragogy was through recognition that adults learn very differently than children. This type of learning is problem solving oriented rather than based upon the idea of content based learning as is more often the situation with children. Andragogy begins with the notion that adulthood comes through a psychosocial perspective rather than through â€Å"a specific biological, social, legal, or chronological age group (Utley, 2011, p.

Antenna Systems For Radar Applications Information Technology Essay

Antenna Systems For Radar Applications Information Technology Essay The project will examine a variety of beam forming techniques which can be used in order to make radar electronic beam steering feasible. Commonly used mechanical rotating antennas for a 360 degrees views coverage are difficult to operate and expensive to implement. Thus, electronic beam forming is an attractive solution. This report is mostly interested in radar applications performing in 24 GHz frequencies, which can be used by car industries, in order to avoid obstacles on the road, for example, or security radars, covering 360 degrees views. Radar 2.1. Radar Definition Radar means radio detection and ranging, determining thus the original and still significant application of radar. The main reason for using radar is to estimate certain characteristics, such as the position, motion and presence of the specific surroundings in which the user is interested. Radar is actually a sensor which transmits electromagnetic energy into the surroundings and detects energy which is reflected by objects. If a directive antenna transmits electromagnetic energy through a narrow beam it is easy to predict the bearing of an object because of the energy reflected of it. The time needed for the transmission and reception of the energy represents the distance between the radar and the object. [21] Kinds of Radar There is a great variety of radars. Some radars provide navigation aid and safety on small boats and their size might be less than 15cm. Others are widely used by the police in order to measure the speed of the vehicles. Moreover, there are some radars so large as to cover many kilometers of land, long arrays of antennas and they all work together in order to supervise the flight of astronomical bodies or space vehicles. In addition, there are many radars at airport, with a more common size and rotating antennas. Finally, there are several radars, more complex, for mobile use. [21] Radars can be classified in many categories. As much as the waveforms are concerned, radars can be classified in 2 categories, they can be either Continuous Wave (CW) or Pulsed Radars (PR). CW radars use different antennas for transmission and receiving, and they emit electromagnetic energy continuously. Unmodulated CW radars precisely determine the target radial velocity and angular position, while information about the target range have to use some form of modulation in order to be gathered. In order to search and track target velocity, primarily unmodulated CW radars are used. Pulse Radars (PR) use a series of pulsed waveforms, mostly with modulation and can be separated based on the Pulse Repetition Frequency (PRF) in 3 categories, high, medium and low PRF radars. CW and PR radars are both able to determine target range and velocity by using different forms of modulation. [23] Continuous Wave Radar (CW) CW radar sets continuously transmit a high-frequency signal. Then, the received signal is permanently processed. In such a system, two problems have to be solved: avoid a direct connection between the transmitted and received energy (feedback connection), conduct the received echoes into a time system capable of doing run time measurements. A feedback connection can be prevented by: spatial separation   between the transmitting and receiving antenna frequency dependent separation  by the  Doppler-frequency  during the measurement of speeds. [4] Frequency Modulated Continuous Wave Radar (FMCW) CW radars are not capable of measuring distance, because the timing mark necessary lacks, preventing thus the system to time precisely the transmit and receive cycle and exchange the measured round-trip-time into range. This problem can be solved by using phase or frequency shifting techniques. As far as the frequency shifting method is concerned, a signal is used, which continuously changes in frequency around a specific reference, in order to identify stationary objects and measure the range. In order to achieve an up-and-down or a sawtooth-like alternation in frequency, Frequency-Modulated  Continuous  Wave radars (FMCW) are used, changing the frequency in a linear fashion. By constantly changing the frequency, there will be a difference between the frequency of the echo signal and the one transmitted. Thus, the difference  transmitters frequency shift will be relative to round trip time  and so the range  of the target too. The frequencies can be examined, when a reflec tion is received, and by comparing the received echo with the actual step of transmitted frequency, a range calculation like using pulses can be done. Consequently, the range of the stationary objective is given by comparing the transmitted and received frequencies. It is difficult to make a broadcaster able to send out random frequencies cleanly, and as an alternative, this frequency-modulated continuous-wave radar, use an easily changeable ramp of frequencies up and down. If the frequency modification is linearly over a broad area, by making a comparison among frequencies within this region, the distance can be easily determined. It is possible to measure only the complete value of the difference and thus, the results with increasing frequency modification signify a decreasing frequency change at a static scenario. [4] Characteristics e of FMCW radar: measuring the distance is potential by comparing the definite frequency of the received signal to a given reference (regularly direct the transmitted signal) the time required for transmitting a signal as longer than the duration of the measurement of the installed maximum range of the radar [4] By selecting the appropriate frequency deviation per time unit, the radar resolution can be different, and choosing the frequency shift duration, the maximum range can be varied. For instance, if the linear frequency of radar increases over 1  ms duration, the time-limited maximum range might be 150  km. If the maximum frequency deviation is 65 MHz, then stay about 433 Hz per meter for the filter for analysis. It is important that the amount of frequency modulation is considerably greater than the estimated Doppler shift otherwise, the outcome will be affected. The most common and easy way to modulate the wave is by linearly increasing the frequency. In this way, the transmitted frequency will change at a continuous rate. If a single antenna is used, a ferrite circulator has to separate the transmit and receive. However, using to different antennas, one for transmission and one for reception, is easier and cheaper to perform. On a ordinary substrate transmitting and receiving ant enna are placed exactly above each other as an antenna array. The direction of the linear  polarization  is rotated against each other by 180  degrees. An extra shielding plate reduced a direct cross talk (i.e. a direct coupling of both antennas) usually. From this direct coupling, arises a signal, which is suppressed due to the same frequency, since the measurement is performed to as a frequency difference between transmit and receive signal. [4] Radar Beamforming In order to create a beam with the appropriate and desired characteristics, radar beamforming, which combines signals from a set of sources, is essential. As much as an RF antenna system is concerned, each source may be a single array element or a subarray. A steerable beam is able to control the combination process electronically. Moreover, it can be replicated so as to create various independent beams, limited by hardware difficulty, complication and losses. [22] 3.1. Analog Beamforming A feed system is a network used in order to connect the antenna input to its radiators. The main reason for using such a system is to transmit power to the elements or collect signal from them. (transmit mode, or receive mode). While being on transmit or receiving mode, the required phase and amplitude excitations needed for the radiation performance must be maintained. The feed network is able to scan the beam, select among different antenna beam shapes and communicate with active sectors, by containing several switches and other devices, appropriate to execute such processes. Moreover, the feed network may contain amplifiers and other active devices. There are also many new developments, such as Switch matrix systems, Butler matrix feed systems and Vector transfer matrix systems, but the most significant are the RF lens feed systems. [1] 3.1.1. RF Lens One of the biggest problems when using a transmission line feed network is that amount of losses. Therefore, systems which are based on RF/optical principles are preferred. There is a large variety of RF Lens and many RF/optical feed systems also incorporate different types of beam scanning functions. RF refractive lenses are similar to their classical optical counterparts, which function by using the refraction amongst different materials. When using constrained lenses, the waves are forced to follow some specific paths, like in a geodesic lens. Another type of lens is the bootlace lens which in which the signals between the input surface and the output surface are routed on transmission lines. Occasionally, a conformal array feed uses different combinations of lens types, or lenses and matrices. Small array antenna elements are used by an RF lens as input/output probes that couple to the lens region. These probes exist in an array environment which is characterized by reflections a nd mutual coupling and the associated design problems. In particular in circular lens designs, there can also be standing waves caused by reflections from the opposite side of the lens. Another problem is the variation of the element phase center with frequency. [1] Rotman Lens A Rotman lens is a parallel-plate structure used as the beam forming network (BFN) for a linear array of radiating antenna elements. It is easy to form a beam forming network suitable for use with a planar array, by stacking numerous lenses. Rotman lenses are preferred because of the advantages that they offer, such as ease of manufacture, light weight, low cost, monolithic construction and availability of many beams at the same time. Rotman lens is capable of extremely wide-band operation, because it is a true time-delay device which produces frequency-independent beam steering. Because of these characteristic, Rotman lens is a possible candidate for use in multi-beam satellite-based applications. [2] The electrical area that a Rotman lens occupies is very large (usually hundreds of square wavelengths) and because of this, an entirely precise analysis is not possible. The planar circuit approximation applies to structures which are electrically thin in one dimension, like parallel-plate lenses. The effort required for their analysis is reduced to that of solving a (line) integral equation for the relationship between the RF voltage and current at the periphery of the structure. [2] The R-2R Lens The R-2R lens feed (Figure 1) has feed ports on the perimeter of a parallel-plate lens with radius R, in order to illuminate the output ports on the opposite side of the lens. These output ports are linked to the element ports on the 2R radius circular array with cables of equal length. The number of feeding ports is half the number of element ports. This type of arrangement allows all feed points to be ideally focused, resulting in a plane-phase front. In order to scan the antenna beam at angle ÃŽÂ ¦, the feed point has to be moved an angle 2ÃŽÂ ¦. One illumination taper can be achieved, by combining three to four adjacent feed ports, resulting in lowered sidelobes. [1] Figure1: The R-2R lens feed system [1] It is essential to add several switches on the lens ports, in order to scan the beam. One has to be allowed to use numerous beam ports at the same time in order to achieve a multiple beam generation. This problem could be solved by using half the lens for beam ports and connect the other half to a 90 ° arc array. R-2R lens are considered to be a special case of the Rotman lens, which is typically used for linear array feeds. Furthermore, for circular arcs up to 90 °, the Rotman lens can be used. Actually, the curvature does not have to be circular, as the design in general, curvature of lens input and output lines, cable lengths, and so on can be optimized together with the array shape. It is possible to achieve ideal focusing in the Rotman lens only for three beam directions. [1] The R-kR Lens The R-kR lens feed system has as much ports on the lens as there are radiators on the circular array. In order to cover 360 ° views, the lens ports have to be used more than once, both as feeding points and for connecting to the radiating elements. In order to achieve this, switches are used, circulators (Figure 2), or two lenses at the same time. The radiators placed on radius R are connected by cables of the same length to the ports of the circular lens with radius kR. When k is about 1.9, a planar phase front for rays within a sector of about 120 ° is obtained. This shows that the lens is nearly two times the size of the circular array, thus, it cant fit inside the circular array if it is not filled with a dielectric with permittivity more than 4. If broadband radiators are used, the R-kR lens-fed circular array can be very broadband. The bandwidth could be limited by using switches or circulators. The phase center of the radiators is a design parameter of critical importance and must be located on the design radius R. [1] Figure 2: The R-kR lens, here with circulators. [1] In order to limit the focusing performance, several types of element have a phase center which is able to change position with frequency. [1] Mode-Controlled Lenses A radial transmission line which forms a circular parallel-plate lens is possible to act like a circular array feed. If it is excited by several probes placed close to the center, the modes generated will direct the energy toward a part of the lens periphery. Therefore, by controlling the modes using phase shifters or a hybrid network connected to the input probes commutates the excitation. Then it is easy to connect these pick-up probes to the radiating elements, via additional phase shifters if needed. [1] Luneburg lenses In order to achieve wide angle scanning, the Luneburg lens, is the appropriate and desired device. As far as land mobile operations are concerned, an antenna able to scan in a two-dimensional (2D) plane is required, particularly if the scan angle is large. The Luneburg Lenses are used in order to provide single or multiple mechanically scanned beams, at microwave frequencies. Nevertheless, because of the advent of phased arrays the lenses are now usually used for radar applications as a wide angle passive reflector. This is why nowadays there are appropriate lens configurations which can be established by permitting the inclusion of controllable dielectric material into a Luneburg Lens so as to make the lens suitable for electronic scanning at 24 Ghz. [1] Digital Beamforming When performing beamforming in the digital area, it is called digital beamforming. The realization can demand huge volumes of digital information to be processed at extremely high rates, but current improvements in processing hardware have made Digital Beamforming a useful alternative to RF combining in many ways. Moreover, it has allowed the formation of systems which were not practical with legacy technologies. Below are presented the benefits of Digital Beamforming. [22] Simplicity of hardware If the RF and analog hardware becomes a minimal device, collecting data, it would be an ideal case. Then, all the difficult and complicated process of the signal is done in firmware, which is a more flexible and gainful way of processing comparing to RF plumbing. In addition, it is possible that the overall size of the system, as long as its weight, will be reduced a lot, and this is particularly significant in airborne systems. [22 Replication Digital beamforming is the best option when many independent beams are needed. By using digital beamforming, it is easy to form each beam completely digitally, without any analog or RF hardware further required. The quantity of beams like these is then partially limited by power, speed and synchronization of the processing elements, which become even more cost-effective and flexible each year. [22] Scanning and Tracking It is not possible to steer electronically each beam (e.g., to track a moving source). However, by using the precisely same stream of digital samples from each antenna element, it is potential to turn each independent beam to a different source. Thus, it is easy to reduce extremely difficult receiver scenarios to firmware buildings blocks which are now usual. [22] Flexibility These digital systems can be adapted without any difficulty to varying requirements, such as multipath combination, application bandwidth, tracking requirements or interference rejection. A SMOP (Simple Matter of Programming) is able to perform numerous adaptations. [22] Radar An array antenna which is a low Cost Transmit/Receive one provides agile beams to track multiple targets at the same time. [22] Anything that can be done by using an analog beam forming can easily be done digitally too. Choosing to do everything digitally might lead to several difficulties because of the extreme requirements on data transmission, storage, and signal processing. However, nowadays such problems are easily solved because of the rapid growth of computer power, either software or hardware. When using an analog reception beam forming, the element signals are combined with weights determined by feed networks and/or phase and amplitude controlled receiver modules. In digital computer, it is possible to do the same operations on the element signals just by converting analog signals to digital ones. Thus, the formation of many receive beams can take place at the same time, without feed losses, which are common when using analog systems. Moreover, the element modules in the digital systems have low noise amplifiers (LNA) preceding the analog-to-digital conversion. A lossless beam forming is created as t he LNAs set the signal-to noise ratio, so that it is not affected by transmission losses. The advantages of a digital beam forming in this case are not so obvious. After the transmission of the beam, it is not possible to change the beam shape or to perform any other signal processing. Nevertheless, digital synthesis of the transmitted waveform on the element level combined with DBF on reception can offer remarkable system capabilities in terms of, for example, LPI (low probability of intercept) radar with jamming resistance. A wide transmission beam illuminating the area of interest and multiple, narrow, digitally formed receive beams has also been suggested for LPI systems-ubiquitous radar and OLPI radar (Omnidirectional LPI). There are many aspects which can best be performed digitally, such as the need for amplitude and phase control, polarization control, switching of the active sector, compensating for element patterns in the beam steering algorithms and calibration. A DBF ant enna system has a combination of numerous subsystems and components. Receiver channel imbalance, , A/D converter offset errors, amplitude and phase errors and frequency dependent errors are some of the possible imperfections in these subsystems and component which can influence the performance of the overall system. The type and requirements of each processing used influence the importance of such imperfections. Usually, array calibration and special error correction schemes are included in the antenna system design. [1] 3.3. Beamforming Transmitter Architectures Several beamforming transmitter architectures exist, suitable for integrated circuit implementation as well as many well-known topologies for separate implementations of phased array transmitters. The goal is topologies appropriate for performance in consumer products at 24 GHz. Electrical beamforming is achievable if the phase of the signal to each antenna element in the array is separately set. Moreover, a larger number of patterns can be achieved and the sidelobe level can be reduced compared to uniform power distribution if the power to each antenna element is set individually. [3] 3.3.1. Baseband Phase Shifting In the baseband phase shifting architecture the phases and amplitudes of the signals are created in the digital baseband. The phase control is very accurate, but the architecture demands an entire signal path between the baseband and the antenna for each element (Figure 3). Also, the architecture can be called digital array, because the beamforming is being performed in the digital domain. Such an architecture lead in a large hardware cost and power spending because there are many signal paths, but also in big flexibility. As a result, this architecture is perhaps very complex for radar at 24 GHz. In order to transmit individual information in various directions, in MIMO systems (multiple input multiple output), the flexibility of the architecture with parallel paths is available too. [3] Figure 3: Transmitter architecture for baseband phase shifting [3] 3.3.2 Local Oscillator Phase Shifting Phase shifting can occur in the LO path as well (Figure 4) Moreover, it is likely to use phase shifters in the signal path, at IF or RF. Whether performing the phase shift at LO or RF or place them at different places, the same amount of hardware is achievable. If they are placed in the LO path, amplitude variation among dissimilar phase settings is less significant if the mixers are driven hard. In this way, amplitude variation in the LO path will not influence the signal path a lot. Thus, it is easier to implement the phase shift in the LO path. [3] Figure 4: Transmitter architecture for phase shifting in the local oscillator path, polar modulation [3] 3.3.3. Offset Local Oscillator Phase Shifting If the power amplifier and local oscillator are used at the same frequency, injection pulling is possible to occur. It might not be easy to accomplish a sufficient isolation so as to avoid the corruption of the oscillator signal by the PA. To moderate this on an architectural level, offset LO phase shifting may be used as shown in Figure 5. Beamforming transmitters have applications like radar (24 GHz and 77 GHz) and WLAN (60 GHz) which are placed at high frequencies. It is valuable to use the lowest frequencies possible on the chip, and multiply the frequency close to the PA. A reduced VCO frequency makes allows a wider tuning range, and the increasing MOS varactor quality factor. [3] Figure 5: Offset local oscillator phase shifting for beamforming transmitter [3] 3.3.4. Ring Oscillator Based Phase Shifting A ring oscillator which has a tunable phase shift among the oscillating elements is used in such architecture (Figure 6). The tuned oscillators in the ring are separately detuned from their center frequency. The LC-loads is capable of sustaining up to +-90 degrees phase shift. It is important that the phase shift around the ring is constantly equal to 360 degrees, or a multiple thereof. The phase shift among consecutive elements is zero degrees if each oscillating element is non-inverting, and no excess phase shift is introduced in the loop. By putting an excess phase shift of KÃŽÂ ´ degrees it will have as a result a phase shift of ÃŽÂ ´ degrees in each of the equal K oscillators in the loop. [3] Figure 6: Transmitter architecture for variable phase ring oscillator in a phase locked loop [3] 3.3.5. Radio Frequency Phase Shifting The phase shifting which is the most hardware efficient, including numeral building blocks, is to carry it out just before the power amplifier. The power amplifiers are the only circuit components that have to be duplicated (Figure 7). The disadvantage is that the phase shifting is being performed at the highest frequency and signal level in the system. When an envelope modulation scheme is used, the linearity of the phase shifters may be a problem while noise is not as significant when the power level is high. It might be useful to implement the phase shifters at the highest frequency. If transmission lines are used as separate phase shifters, they become shorter with frequency. This is an ordinary architecture in radar systems. Several fixed phase shifts are in that case implemented and switches controlled by selection logic determine the phase shift. Certainly, the transmission lines are linear and thus, these phase shifters can easily be used in envelope modulated systems. Moreover, the delay is stable over a wide bandwidth. A set of fixed phase shifts is then implemented and switches controlled by a selection logic choses the phase shift. Of course the transmission lines are linear so these phase shifters can very well be used in envelope modulated systems. Another advantage is that the delay is constant over a wide bandwidth. [3] Figure 7: Transmitter architecture for phase shifting in the radio frequency path. [3] Applications for 24GHz Radar Sensors Modular 24 GHz Radar Sensor for Digital Beamforming on Transmit and Receive In order to increase the angular resolution, numerous switched transmitters are preferred, as they need less hardware effort. The FMCW radar sensor is the best solution, providing up to eight transmitters, switchable ones, and eight receiving channels which provide parallel receiving, and they all allow digital beadforming. An innovative switching technique via switchable amplifiers is preferred. [5] Four Channel 24-GHz FMCW Radar Sensor with Two-Dimensional Target Localization Capabilities Results on the angular measurements are improved when using an FMCW radar sensor, compared to standard beamforming methods, as far as the target localization is concerned. Furthermore, the determination of other characteristics required will be allowed, such as the range or velocity. [6] . 24-GHz Automotive Radar Transmitter with Digital Beam Steering in 130-nm CMOS (Complementary metal-oxide-semiconductor) Many Pas are connected to different antenna elements so as to control the steering of the beam. The output phases of the PAs are controlled separately through 360 degrees by binary weighting of quadrature phases. The circuit has 18 PAs,and each one of them delivers 0 dBm to the antenna, ensuring an output power of 13 dBm. The antenna array, which is constituted of 18 elements, will be 11 cm at 24 GHz and will have 12 dB directivity and a half power beam width of 5 degrees. [7] Design and Performance of a 24-GHz Switch-Antenna Array FMCW Radar System One transmitter, one transmitting antenna, four receiving antennas, one receiving channel and an SP4T switch (single-pole four-throw) are the elements which compose a 24-GHz FMCW radar system. In order to increase the inter-connection loss and create a compact whole size, radio-frequency (RF) and intermediate-frequency (IF) circuits are integrated in the antennas. The receiving antennas are sporadically switched to the receiving channel. Beamforming methods are used in order to evaluate the performance of such a developed system, by estimating the angle, velocity and range. [8] Imaging Radar Sensor Front-End with a Large Transmit Array Automotive applications need medium range imaging radars, such as the 24 GHz imaging radar front-end. In this radar, a large switched transmit antenna array is combined with a coherent FM-CW architecture. It permits two dimensional electronic scanning in range and cross range with excellent crass range resolution over a wide angle of new using very low EIRP. The advantage of using such radar is that it requires just a small number of active millimeter wave components. [9] Novel Photonic Rotman-Lens Design for Radar Phased Array Antennas A new microwave photonic implementation of a Rotman-lens is proposed in this project, providing superior performance and functionality. The scanning unit presented is an optical element, where photo-detectors attached to the transmitting/receiving antennas are the interfaces, doing conversions among the RF signals and their particular optical waves. Actually, the optical module is a photonic Rotman lens, designed like its RF complement. Despite the advance of practicing the solution in a photonic module, the recommended photonic Rotman lens superior design is able to realise a linear phase profile with a varied slope at the output of the lens for any potential spot at the input to the lens. This is contrary to what is presently accessible with the usual RF Rotman lens, where output phase front linearity is achieved for a small quantity of input spots. A better performance is achieved by increasing the curves of the photonic input and output surfaces of the lens, having an off-centere d elliptical profile, and not the typically used spherical curvatures. [10] Virtual Antenna Beamforming (VAB) for Radar Systems by Using Orthogonal Coding Waveforms An original way of creating virtual transmitting and receiving radar antenna beams at the same time is to use orthogonal coding waveforms from the antenna elements and deal out digitally their echoes at the receiver. Many virtual transmitting-receiving radar antenna beams can be produced at the same time by using the same quantity of beamforming filters with no any increase on the transmitted power or antenna gain or resolution loss. Both virtually formed antenna beams and common phased arrays of equal size are able to achieve the same antenna gains and spatial resolutions. Since the antenna radiation pattern can be completed almost isotropic, the original system has low probability of intercept (LPI) property. While the transmitting and receiving beams are both virtually implemented through digital filtering, expensive radiation phase shift used in phased arrays is unnecessary for beam scanning in this actual system. [11] Compact Two-Layer Rotman Lens-Fed Microstrip Antenna Array at 24 GHz A new way of realizing a compact Rotman lens-fed antenna array is presented in this paper. The lens-fed antenna has the construction of two layers, which is an original option of reducing the Rotman lens size. This is performed at 24 GHz approaching automotive sensing radar. The lens has a metal layer on the top, a dielectric, a regular ground, a dielectric, and a metal layer on the bottom, in sequential order. The antennas are put on the top layer, while the layout of the lens body is positioned on the bottom layer. They are both connected electrically via slot transitions. This structure, composed of two layers, offers many advantages, because it reduces the entire size of the lens, as well as the total loss of the delay lines, as the lines can be as short and straight as possible. This two-layer Rotman lens-fed antenna array is evaluated in terms of scattering parameters and beam patterns. [12] Cylindrical arrays with electronic beam scanning In order to provide a continuously 360 degrees scan by the directional pattern of a cylindrical array using electronic means, there are several methods proposed. It is important that the circular aperture distribution related to the far-field directional pattern is subjected to rotation comparative to the fixed array. With the intention of synthesizing appropriate forms of directional pattern, there are various techniques describing the independent control of the amplitude and phase of the aperture distributio

College Entrance Essay: Moving to the US :: essays research papers

University of Washington Admissions Essay The challenging family situation I would like to share with you is our move from Korea to the United States. In 1989, my life was changed when my family immigrated to a new country, hoping for a better future. My life in Korea was hopeless, because I was a failing student with not much interest in school. I spent the majority of my time in Arcades, wasting my coins on video games. Rather than studying with my friends, as I had told my parents I would, I obsessed over the games. The only positive aspect to my life was my private computer programming lessons. Programming in Apple BASIC presented me with an opportunity to create my own world. One day, my parents told me that we were going to move to the United States of America, and I developed a strong feeling that my life soon would change forever. After spending eleven years in Korea, our family moved a totally different environment. This I knew would be my toughest challenge to date. As a fifth grader attending a new elementary school in a new country, I felt left out because of my inability to communicate. Some kids assumed that I did not understand them at all, so they made rude remarks about me. I understood them, maybe not completely, but I knew the intent of their messages. All that I had was my Apple II computer at which I just sat and programmed when I came home from school. At home, my parents pressured me to study all of the time, but I was frustrated and wanted to return to Korea. I wanted to go back and talk freely with my friends and play games with them. My parents often told me that they decided to move here because of the educational opportunities, yet I continued to rebel and refused to listen to what they said. Over time, my English improved. I moved on to regular sixth grade classes; some of which were challenging, but tolerable because of my teachers whom were willing to help. I always enjoyed class trips to the computer lab, where I would start programming on the computer. Other kids would start to gather around and treat me like a genius. Before long, I made more friends and found that I was enjoying school. Thoughts of going back to Korea faded, and my grades rose to a satisfactory level. This pleased my parents who now encouraged me to invite friends to dinner.